Sparking plug.



0. FREIBERG.

SPARKING PLUG.

APPLICATION FILED SEPT. 19, 1913.

Patented Aug. 11, 1914.

OSKAB FREIBEBG, 0F GAUTZSCH, NEAR LIiPZIG, GERMANY.

SPARKLING PLUG."

specificati@ of Lemie' Panni. Patented A nir` 1.1 .1914.

Application tiled September 19, 1913 Serial 01 790,833,

To all whom, it may concern Be it known that I, OsKAn Fnsmnno, a subject of the German Emperor, and resident of Gautzseh, 'near Leipzig, Germany, have invented certain new and useful Im# provements in sparking Plugs, of which the following is a Specification.

.Hitherto, sparking plugs have become known, inv which at the same time sparks are `formed at several places, for which purpose either one or both spark contacts terminate in several contact points, or the contact wire is interrupted at certain places and at its other arts surrounded by insulating material., tiese arrangements having the drawback that 'at the gaps between the insulating material dirt, oil or the like may settle, or the distance between the Contact points becomes gradually larger and larger owing to burning of the contact points until a formation of sparks does not happen at all. In another type of sparking 'plug between the spark contacts connected with the circuit one or vmore auxiliary contacts are arranged with the object to eti'ect a formation of sparks between thc main and auxil iary contacts upon the voltage having become too weak for a formation of sparks between the main contacts. It vhas also been proposed to arrange one row of auxiliary contacts between the main contacts, which in some cases are all disposed in circular fashion.

mationof sparks is not absolutely reliable, or that the sparks are not always-vigorous enouoh for cti'ect'ing under all circnmstnm'es n reliable ignition of the gas mixture in motors, by the latter being: frequently dill`- cnltly inflammable so that. with :i woah spark formation :in ignition ot the gas mixture may not happen. All these drawbacksl nrc overcome by thc subject matter of thc present invention by offering to the formation of sparks not one way only but n large colcction of ways, whereby a perfectly rcliahle ignition is obtained. Owing to its reliable action,the improved sparkingplugr is particularlyndaptcd for use in conncction with internal combustion motors l'or motcrfcars. flying-apparatus, and the like.

'The invention essentially'consists in arranging between the main contacts connect4 ed with the circuit a large nnmocr of crosswise arranged parallel rowsot auxiliary contacts of particularly appropriate form All these hitherto known sparlcvv ing plugs have the drawbacks that the forin a non-conductive way and at distances of aspurk from each other in such a wav that a. large nulnhcr of ways is offered foiA the formation of sparks wherebv at each ignition e large number of sparks vare safely obtained. i*

The accompanying drawing shows the` subjectv matter of the present. invention.

Figure t is a central lon `tudinal section throueh a sparking lug. tig.' 2 is an un dcrsir c plan View o the same; `Fig. 3 is a rear View of a sparkin., ping; of modified construction, and Fig. is a longitudinal section through the latter on the line A-li of Fig. 3.

Referring to Figs. and 2z-fthe con struction shown is particularly adapted for use in connection` with motor-cara, tiring apparatus and the like, its outer sha e being similar to those hitherto ernployeiln The outer body 11. of iron or. other metal is, as usual, provided` with lower seres-threads for itsbeing screwed into the cylinder wall. and it serves forthc reception of an insnlati ingy body b of porceiain or the iike. At the inner end of the latter, contacts c of pris matic or other cornered shape are so ai ranged that the corners of the contacts are separated from the corners of the adjacent'. contacts for the distance of a spark, so that each contact is allowed to form at a time a plurality of sparks in several directions. (lne ot' said contacts is connected with the lead t! and another one with the iead c of the circuit. The lead e is' connected with te metal body a, which in a Wayfk'nown in the act receives its conductive connection by connection ot' the motor casing to the circuit, while the .second lend l is nonfcondnetirely lcd through tllc porcelain body :ind eonnccted with the circuit by a contacbscrew.y

A cconlingto the size of the motor, or te the,

quantity ot' the volume of the gras mixture to lic ienitctL and according 'to the easier or more difficult. ignition of thegas mixture, the number and arrangement of the spark contacts c can bedctcrmincd. y Referring to Figs. il and linthe construetion shown is particularly adapted for large motors. for which purpose n very large. umnbcr of contacts c is arranged in several rows beside Unch other. auxiliary contacto 1' and the main contacts d nml r connected to thc circuit are inserted in :opiate ry of porcelain or the like insulating material. which may bc further iizb G l` in the construction, the' liti ijs

nase plate h, which luis holes z' for the lixingscrews und which may be made either also of insulating material or of metal, the leads tis the conta: 'LS Z und e being' in the lutter insulated from the plate l1. The supply of current. to the contzictsrl and e may be eifectef: through terminals f. Obviously, the construction nf the sparking plug may be further modified to suit requirements.

1 claim:

In a sparking plug, the combination ofl main contacts connected with the circuit, and a large number of crosswise arranged parallel rows 0f auxiliary contacts of prismatic slxape=beveen the latter arranged at i5 sparking `(.Au'ST-'ices from euch other, Subu stantiullvrifund for the purpose set. forth.

Y' *OSKAR FREIBERG.

lVitnesses RUDOLPH A. Fniclie, N. R. SNYDER. 

